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#! /bin/sh
######################################
##### Model Transformation Tools #####
######################################
# Bourne shell script: mtt_make_sim
# Copyright (C) 2000 by Peter J. Gawthrop
###############################################################
## Version control history
###############################################################
## $Id$
## $Log$
###############################################################
# Tell user
Sys=$1
method=$2
if [ -z "$method" ]; then
method=implicit
fi
#
echo "Creating $1_sim.m with $method integration method"
if [ $method = "implicit" ]; then
ode=cse
odeo=cseo
else
ode=ode
odeo=odeo
fi
# Find system constants
Nx=`mtt_getsize $Sys x` # States
Nu=`mtt_getsize $Sys u` # Inputs
Ny=`mtt_getsize $Sys y` # Inputs
# Header
lang_header -noglobal $1 sim m 'x0,u,t,par' '[y,x]' > $1_sim.m
cat >> $1_sim.m <<EOF
## Initialise
ui = zero_input($Nu); # Zero the input
xi = x0; # Read in initial state
yi = $1_cseo(xi,ui,t(1),par); # First output
##Sizes
N = length(t);
## Initialise arrays
x = zeros($Nx,N);
y = zeros($Ny,N);
y(:,1) = yi(:);
A = zeros($Nx,$Nx);
Ax = zeros($Nx,1);
dx = zeros($Nx,1);
## Step size
dt = t(2)-t(1);
for i = 1:N
ti = t(i);
ui = u(i);
y(:,i) = yi;
x(:,i) = xi;
dxi = $1_cse(xi,ui,ti,par); # State derivative
A = $1_smxa(xi,ui,dt,par); # (I-Adt)
A = reshape(A,$Nx,$Nx);
Ax = $1_smxax(xi,ui,dt,par); # (I-Adt)x
#open = eval(sprintf("%s_switchopen(x);", system_name)); # Open switches
#x = mtt_implicit(x,dx,A,Ax,dt,$Nx,zeros(20,1)); # Implicit update
xi = A\(Ax + dxi*dt); # Implicit update
yi = $1_cseo(xi,ui,ti,par); # Output
endfor;
endfunction
EOF
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